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Tennessee onions combine layers of sweet Vidalia onions with rich butter, spices, and a medley of cheese for a savory delight. Each round remains intact, absorbing melted butter and a blend of Italian cheeses, cheddar, and parmesan turning tender in the oven. The result is a golden, bubbly casserole with a comforting, sweet-savory flavor and irresistible aroma—perfect for serving warm as a side or star dish at gatherings. This dish highlights the natural sweetness of onions, complemented by garlic and oregano, baked to perfection!
Ingredients
- Vidalia sweet onions: Choose onions that feel firm and heavy for their size the sweeter the better
- Unsalted butter: Adds richness and helps the onions become luxuriously tender
- Salt: Enhances the natural sweetness of the onions choose a flaky or kosher salt for best flavor
- Garlic powder: For a keen but subtle garlic background
- Oregano: Brings a hint of freshness with Italian notes dried oregano is great here
- Italian blend cheese: Melty goodness with depth from several cheeses check for a blend with mozzarella parmesan provolone asiago and romano
- Cheddar cheese: Gives a classic tangy sharpness select a bold cheddar for more kick
- Parmesan cheese: Lends a salty nutty finish use freshly grated for best melting and flavor
Instructions
- Preheat the Oven:
- Set your oven to 350 degrees Fahrenheit This heat lets the onions soften completely and the cheeses become golden on top
- Prepare the Baking Dish:
- Grease a nine by thirteen inch baking dish generously with nonstick spray so nothing sticks and cleanup is easier
- Slice the Onions:
- Take your Vidalia onions peel them and slice into thick rounds about one quarter inch Each slice should hold its shape and rings together for the best texture in the bake
- Arrange and Season the Onions:
- Place onion rounds in a single layer covering the dish and try not to separate the rings This helps with presentation and keeps the whole slice juicy Sprinkle with salt garlic powder and oregano so every bite comes out flavorful
- Add the butter:
- Cut the butter into equal pats and dot them over the onions so the whole dish is evenly covered The butter will melt over everything for richness and tenderness
- Layer on the cheese:
- Sprinkle Italian blend and cheddar cheese over the onions making sure to cover gaps Top everything with an extra layer of Parmesan cheese for that signature savory flavor
- Bake to Perfection:
- Put the dish on the center rack of your preheated oven and bake for thirty five to forty minutes The cheese should be bubbling with golden spots and the onions will be fork tender Let the dish rest for a minute before serving hot
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